Anorexia and friends :/?

I dont feel like my friends are really supporting me through everything, I have battled for a while now and I am 18, i was diagnosed back in january after being hospitalised for malnutrition and dehydration,I kept it a secret for so long and I would use any excuse not to eat, I would stay away from home whenever possible by going to my friends houses, I was very secretive, but in January at my friends birthday party we all went for a meal and I barely ate anything and had to go outside because I was heaving and had to stop myself from throwing up and then I thought by secret was out :/ I don't feel like they will be there for me when I need them even though I am always there for them no matter what the situation is :/ what should I do?